SPRINGFIELD — Mayor Domenic Sarno blamed gangbangers and the businesses that lure them to the city for Sunday morning's gun violence that left five people with serious but non-life-threatening injuries.

Police initially indicated there were four shooting victims outside Lux Nightclub and one outside Baystate Medical Center, but now say they can only link two of the five shooting victims to those locations.

Authorities believe the incidents are connected, though they are continuing to investigate where the other three victims were shot, according to police Commissioner William Fitchet, who joined Sarno at a Sunday afternoon news conference in front of Lux Nightclub, 90 Worthington St.

"We believe that all of the shootings are related," Fitchet said.

Police say the victims have been uncooperative and that no criminal charges have been filed.

"This was gang-related and they are not cooperating," Sarno said, faulting gang members and the businesses that attract them for spoiling the fabric of the city.

Sarno renewed his pledge to crack down on city establishments that draw unruly crowds and encourage "negative activities," adding that Lux Nightclub's owners will be summoned for a License Commission hearing as soon as possible.

People who "act like rabid animals" should be treated the same way, said Sarno, who also blamed parents for allowing their children to roam city streets with reckless abandon.

"Take care of your goddamned kids," he said, clearly frustrated that Springfield's negatives, such as headline-grabbing shootings with multiple victims, tend to undercut the positives.

The mayor cited numerous downtown eating and drinking establishments, from Theodore's restaurant to Adolfo's Ristorante to the Student Prince Cafe & The Fort Dining Room, as the types of businesses with staying power that don't attract negative elements.

Fitchet and Sarno were joined by incoming police Commissioner John Barbieri, who officially replaces Fitchet June 1, department spokesman Sgt. John Delaney, and one of the detectives working the case.

Meanwhile, the owner of Lux Nightclub says he's tried to run a safe, respectable and diversified establishment since he bought the business about eight months ago. Sherwood Jarrett says he followed proper protocol by hiring two police officers to work a security detail at the club on the night of the shooting, which occurred outside the business at about 1:58 a.m. Sunday.

"The default response is to blame the nightclub," Jarrett said, urging the mayor to reach out to businesses that hire locals and help stimulate the city's economy.